Update 3_interpolate_image.pdf expectation

Bug: pdfium:1790
Change-Id: I81e05b82ca56caeb240dd878b1b8e9d6cb6c56e8
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/96811
Reviewed-by: Lei Zhang <thestig@chromium.org>
1 file changed